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Combined electrode of battery and preparation method thereof

A composite electrode and battery technology, applied in battery electrodes, electrode manufacturing, active material electrodes, etc., can solve problems affecting electron and ion transmission, etc.

Inactive Publication Date: 2014-04-16
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductive carbon black, binder and other materials added to the electrode are wrapped around the active material, which still affects the transmission of electrons and ions.

Method used

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  • Combined electrode of battery and preparation method thereof
  • Combined electrode of battery and preparation method thereof
  • Combined electrode of battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation of embodiment one composite electrode

[0032] The preparation method of composite electrode comprises the following steps:

[0033] a. Disperse carbon nanotubes and active materials evenly.

[0034] Use a digital balance to weigh a certain amount of active powder material, pour it into deionized water that has been added with surfactant, add carbon nanotubes at the same time, and place it on an ultrasonic cell pulverizer for 2-10 minutes of ultrasonication.

[0035] b. Prepare carbon nanotubes and active materials into a film with a three-dimensional porous network structure.

[0036] This step can use one of the vacuum filtration method or the natural deposition method.

[0037] Vacuum filtration devices such as figure 1 As shown, it is composed of a buffer bottle 1, a suction filter bottle 4, a vacuum pump 5, an exhaust tube 6 and a clip 7, and an alumina template or a PVDF filter membrane 2 and a filter paper 3 are added between the buffer bottle ...

Embodiment 2

[0046] Embodiment two by Li(Ni 0.5 co 0.2 mn 0.3 )O 2 Shell-type Li-ion half-battery with composite electrodes composed of / CNT / SEI

[0047] The preparation of composite electrode: adopt the method in embodiment one, with Li(Ni 0.5 co 0.2 mn 0.3 )O 2 As the active material, single-walled carbon nanotubes are used as the conductive network, and the positive electrode of the three-dimensional conductive network is formed by vacuum filtration method, which is cut into a disc with a diameter of 3 / 8 inches, and a 2032 shell-type half-cell is composed of a separator and a lithium sheet. Through the first charge-discharge cycle, a SEI layer with high ion conductivity is coated in the three-dimensional network and on the surface of the active material to form the composite electrode described in this application.

[0048] The schematic diagram of the composite electrode structure prepared in this example is shown in figure 2 As shown, the scanning electron micrograph before c...

Embodiment 3

[0049] Embodiment three by Li (Ni 0.5 co 0.2 mn 0.3 )O 2 Shell-type Li-ion half-battery with composite electrodes composed of / CNT / LiPON

[0050] The preparation of composite electrode: adopt the method in embodiment one to use Li(Ni 0.5 co 0.2 mn 0.3 )O 2 As the active material, single-wall carbon nanotubes are used as the conductive network, and the positive electrode of the three-dimensional conductive network is formed by vacuum filtration method. The coated LiPON solid electrolyte is prepared by radio frequency magnetron sputtering. The sputtering parameters are: radio frequency power 40-80W, working pressure 1-2Pa, working gas high-purity nitrogen, sputtering time 20-60min.

[0051] Battery preparation: Cut the prepared composite electrode into a disc with a diameter of 3 / 8 inches, and form a 2032 shell-type half-cell with a separator and a lithium sheet.

[0052] The structure of the composite electrode prepared in this example is the same as that of Embodiment ...

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Abstract

The application relates to the field of energy storage materials, and discloses a combined electrode with ultrahigh electron and ionic conductivity and a preparation method thereof. The combined electrode is formed in a manner that a battery active material is uniformly tied in a three-dimensional multi-hole network formed by carbon nano tubes which are connected in a crossing manner, and meshes and the surface of the active material are filled or coated with a solid electrolyte material. According to the combined electrode, the carbon nano tubes, which are communicated with one another, can form an ultrahigh electrical transmission network, on the one hand, a solid electrolyte can provide the ultrahigh lithium-ion transmission capacity while not influencing the connection of the carbon nano tubes and the conductive capacity of the electrode; on the other hand, the three-dimensional network formed by the carbon nano tubes is also fixed by virtue of the solid electrolyte, the formation of a solid electrolyte interface is controlled, and an active material is protected under the high charge-discharge voltage. The combined electrode has the high reversible capacity and the enhanced rate capability, and can meet the requirement of a power automobile or a mixed power automobile.

Description

technical field [0001] The present application relates to the field of batteries, in particular to a composite electrode for batteries and a preparation method thereof. Background technique [0002] Energy issues are a major strategic issue in the 21st century, and the development of new energy equipment and power vehicles has put forward more stringent requirements for energy storage. At present, the progress in the field of energy storage mainly depends on the development of battery technology. In battery technology, the capacity, rate, and safety of positive and negative electrode materials play a key role. [0003] Taking the lithium-ion battery widely used in real life as an example, its electrodes are generally required to be able to transport electrons to all active material particles, and to be able to quickly transport lithium ions to all active materials, that is, the electrodes require both high High electronic conductivity and high ionic conductivity are require...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/04
CPCH01M4/0407H01M4/362H01M4/624H01M4/625H01M4/626H01M2004/021Y02E60/10
Inventor 吴忠振潘锋范浩森
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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